Mason County, Kentucky (Formed 1789) Land Area Year Population (sq.mi) Density 2010 17,490 240.1 72.8 2000 16,800 241.1 69.7 1990 16,666 241.1 69.1 1980 17,765 241.1 73.7 1970 17,273 241.1 71.6 1960 18,454 241.1 76.5 1950 18,486 241.1 76.7 1940 19,066 241.1 79.1 1930 18,862 241.1 78.2 1920 17,760 241.1 73.7 1910 18,611 227.0 82.0 1900 20,446 204.0 100.2 1890 20,773 204.0 101.8 1880 20,469 241.3 84.8 1870 18,126 241.3 75.1 1860 18,222 243.9 74.7 1850 18,344 245.1 74.8 1840 15,719 243.9 64.4 1830 16,199 243.9 66.4 1820 13,588 243.9 55.7 1810 12,459 241.9 51.5 1800 12,182 1,874.3 6.5 1790 2,729 5,535.3 0.5